Layered catalyst composite
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First Layer
[0053]The components present in the first layer were 10% baria stabilized gamma alumina, lanthanum oxide, strontium oxide, zirconium oxide, neodymium oxide, a composite of cerium and zirconium oxide with approximately 30% ceria content and palladium at the concentrations of 64%, 6.4%, 6.4%, 2.6%, 6.4%, 12.8% and 1.1%, respectively, based on the calcined weight of the catalyst. The palladium (30 g / ft3) in the form of palladium nitrate solutions were impregnated by planetary mixer (P-mixer) onto the stabilized alumina to form a wet powder while achieving incipient wetness. The other components such as promoters and stabilizers were introduced as their soluble salts using water as the slurrying vehicle. The aqueous slurry was formed by combining all above components and milled to a particle size of 90% less than 9 microns and coated onto the cordierite carrier. After coating, the carrier plus the first layer was calcined at a temperature of 550° C. for at least 2 hours.
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